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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7df7fba45433ec2ea550f3449ef433c2cbd06993ff9f64f3dcaeff32f9029caf' 
  AND token = '6YujsKImHEe/Hfnf0u3sEHTGI3DJFq7KKDuS1Dryn/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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