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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54f5950875d4930c0e6f30ab047a102527665a2f2a51e6ee8820a9f8dea1b9fb' 
  AND token = 'd/ubWcdTXzMaBwvb8dleEhMoHSdfWvQA6prfYIzDVuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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