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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c882eb93e675d3b6fe65741591bfcae7e7456a3e3b7e180ad21087be1ea5795' 
  AND token = 'MQ3BA8ylU6uniWmbgV5eqUKxHZCk3W5g9e5cOgfqJT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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