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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd44c414b8bf1e5f6c79b43846b09d64b4cbc191e128ef186c2a15c5f17b07393' 
  AND token = 'ih476MC5BSb7oUBlDXjCd8qq6AuikjP0x6XZcA12UV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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