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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f76f6cb6a059a52d365cdd7b640afeaba1194d0474f0eb67c70d1b5727d37d93' 
  AND token = '1CHbeuN5ZyzYRBpBiRJV09WYdxBo+00hcNtUe/g9u/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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