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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c45984eb5fb74f5a4572a138719dcd8f920f3ee963b398a7bd22e362e4c186c' 
  AND token = '7coEcIOvdna9H9pxMarpgU/gxuyUDvUg1s3FlJBJHPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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