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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd835efa419cf7e9dac930e48cd48a8ac1a09a0b3cdcd1f03cd7813986f2c89cf' 
  AND token = 'W1t/zJDnRE0iauz4XeBzXmY9CrptATg/IJpFciKk+Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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