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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4365e1db24fe7ffd5979796134fe084eff7b8a6d3604db66b5d3afc93e2db87f' 
  AND token = 't+xTN8MH5QLOFX6PBrIoFyaA9GRASfoTmLDMFZlfT+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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