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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '913f1db8bc67ec39528093e5c869e0a045085f19452c88c0a996eda63d434c57' 
  AND token = '31UcO1/ao8KObYZ6iFQimIAQ6TzrMCM/1bJ7K4Pxi1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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