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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8281b17a6ac5100f71b1bb7ae910dc9c6eaeea9d1c911d0360879bd0fc3297e3' 
  AND token = 'auh7I1GZDtru9h+AXFYhfqtJAiEF6M/Ancf4r+fZTLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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