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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2d9693dc2d7332b10fc81c872bf2e9f5082ed3ee8e6bf01fe6b5c0cf7900b4e' 
  AND token = 'qxSQti45w3F7arLXZ8yoNAwK0iwcYKFIMPXCgJzYL2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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