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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a01c7057b2d81fc2edaea6047136b828242ddc75a7b27c0be52b7b9e54c3b009' 
  AND token = '/loE9550WQwj0KM1+i9M5DPltRLBuu9rNd/1rsPQvDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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