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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f1ddc3801688239d57161630c5ca35df7b771faac3ef919ac4dd2b1a3f583d7' 
  AND token = '6Dr4aLkM8/+LM/i9wug6IFTG0tNuue4PhGX6jBKObMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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