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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b94986731187ced5827886e2c2f59ca26945deb6610b0f635d23f71452da4b0' 
  AND token = 'EcIONIy26L+kIpyLFDXnXhegSqg7pZbWC8WhiQHHO2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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