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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '431abc8682f1ebc38ff401f4ece95d76aceeb15023cefb1360016e7bb84a55b2' 
  AND token = 'llvSaIbwrGgavOGjiW7/DlLX4SBgdDE8UGzE3MwPDoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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