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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e11bf8dfcbdbac30bde981b67d0ad72404ea173ba17dbeb74772fc1ca45dbd8b' 
  AND token = 'lmodPhAjDQs9WGM5sywsJiC3UHV3E6YQg96Eip6fMto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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