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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f51b696d0afc7015f06d395fb9e2e160555945d552c41a781948b4416561d72' 
  AND token = 'zvx0Nu8N95ivdLt2ARvZPO86Jy1/4uZZJnLy0KDMLsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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