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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7e610418cec894266b11039ae79b2bb7a48d14cc6025b41f30ebe0cb6da9c9a' 
  AND token = 'UEl9z1XEQQPR3C8l0pd53WTjXX2bp+VFMQjPg/Rnae0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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