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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fd07081040d6ebb9a5bb97a3c79c2c658590e8e448ba131764ed81befdbdbf6' 
  AND token = 'HUL1UeWQf61NfnqocPq5LfYEWNGR84zLxrHvtKb0zZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}