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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b3f0c7aa33508e8ff946fa4728b4065617080800996c9d504a73b9839276b48' 
  AND token = 'Gy1SUbxTkzxSzE4dq+qzurlmRRyWI1NrjT2rGwlahjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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