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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4baad465ca240dd697b64e3cf79ec4a3a419e1d5e219456cecd8dc02e7004e8b' 
  AND token = 'CEaHaSJMu/+OD/CknDFJVSkZxeqF4uvQ3REESJvG/j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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