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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1557da635ab6fa4d9babaed4c3a50dc0761ed84f7a2b6f4a55261b5ef187bf94' 
  AND token = '1D6CTO0Zqj7tfOUiqQILrbV+iWIiN7kepPk2YgKNsTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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