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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b88860afd3e34393e3f8221455700bbd246633e5df6e57924c0b6c7bb70ad7f' 
  AND token = 'phC8nzR5LkL1I7KOaGAQdWWRyJyeTfY4HR67zYA5wio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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