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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1a68cbcb0b33d109ef5d6bc3215a7248859684c931640d59702675be0b17b31' 
  AND token = 'nMQh6TKOmmCOVFxNnfXwxjfQ9dbIM3pcKv0Um7lfKn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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