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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '241956c0fb76cf6687bc99a874086c770ab76459de250101b098aa0aaa90f1aa' 
  AND token = 'vPE4sLDl5pLeGghcANjdId8C+sUFS/Zsv5pa4mfAWQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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