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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a122279d4789eddba97357e9329df22ea98226d8ccf4344db3edcacded47e96' 
  AND token = 'frSi6+kCajSf19Czz4Il9IR/0IXFH8vVqGxTWm8Y+CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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