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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfa0e1387521a81c2c78fd39acb3f8dd6d0be09edd4ab738afaddfd4da98bd20' 
  AND token = 'd8Se4ZT6R9Qck86t3ho+UaQh3Tl5dGxJtHvLx7Z+R08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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