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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d2870e4c6c95248cdc5fd4e33546797f5b3a7942b284fe95c15ad13752f9582' 
  AND token = 'KkDsfy9ZD7TqeTwxm0fS69GEvI1+XkV/adLQECM7qXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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