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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd7e1799ebdadf061843e650042c3b3095abcec41035e827a16bdf14899706ff' 
  AND token = '89fAUj4ZT6trlcLVhAP77ycI3i6xlo3eFhTdG22MwmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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