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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd03d905b8e3156788b6d2a62742f45847b5b9d730ff928b1796da4ad3e378732' 
  AND token = 'cRi97iQFX8p65VzUdDswFKT5WXUpknVI7JVY47wTwbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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