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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2cd6c5c4517322206b66c92f2aae5faadb2f6cf8e9a876f07f7fc15c70ddcc46' 
  AND token = 'Lu+pP+pPPHrH7uDEsHgQhi4r/czSHb5A/MumINWOvfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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