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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50a916c61c834290c0d12989e44a1e0d335367e376d489d0350c653296b1b825' 
  AND token = 'Q5xRqDs/DJTY7p5rCX/2vk0dtHIBNJ6bGWKF0BHyaXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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