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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34715ea2b7bff5fd1124daa2b864f89a50f745f9fd3db581ff14b18fa167919e' 
  AND token = 'crjkvWzf4vXfl4jbKXPejXP0vDobcwihheCS7nz8bto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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