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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25028eee7c88de82c383037427a8f91a202fa6e3638a0d0c1dc3ad406078c7f5' 
  AND token = '15EMMYowl1EiXY/9Jsh0mdsUYNhnJA4cEGoGzOMhDwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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