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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fa658d7426814a8424b5e8aecd500e381758909b95806516ffe885703a44062' 
  AND token = '0hXDedY3OhYLfhu3KoszqzPT38T3O1+FY+I2OLrKD24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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