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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58c987094ea489d0b7ed7d08642e9b94b4bfdf3fa75ede71d57d3530293e4bf3' 
  AND token = 'jRbWlV9Q03n5FVQruj64fi1v+4uEabtZxqgQl0hRmbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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