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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb6aaca6c78d653728bda5a237ecf39c741f37d50e1a14f756867da34be2953e' 
  AND token = 'X3BmGVr2fykHBT5nmP6k62xcWBFpizmNM+Gs3RnjbqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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