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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6baeb25a72ac364b46ada007668c2f09e2b897de170e952f5d51b49ee75c9d4' 
  AND token = 'Ec3IRwp+92Ro3//5SnkW6w0MWwXD6VhZbaYdmRU4+Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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