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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1dd53213a8384b4f2d361369fcc44a3f83885e797a5c1eb4bed786e8ec6115c' 
  AND token = 'wP3DlVq5w9qeUAdA2ftgPGgtm0n754ycuwHvXz8PFZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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