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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2620f8ca404274a2d3f6b69123681858c223605ca10d7b3313ced2299279a7f' 
  AND token = 'UBtC2RV4UCe97hvWAT5YYRtI3c2pQvj0WFx56/BCfeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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