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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c577f4f06d5b87ca1d92e1292cc68557b3eafc51dcbdcd568987b9e9085423a' 
  AND token = 'IGqltzs74wbtt1AawR6IC8XG136K3g8HKQ6IGe89cmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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