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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bac5d64a9bce9e3f4636cdc8634fb76d822bf325204e9ea55f0c37d6e64b6aab' 
  AND token = 'i0OzoNefabmGikQ2+syojYir/tc1PQtAQNsBaQfg6a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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