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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f44fd50df4fed40b599c387240ded503c9670e6f019520655787e255d8a0657' 
  AND token = 'RnQ28algfReV2dclTTJaZr8Zbrn7HeCDB9VUwcq1G/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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