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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd92bb35254736e9a995c48d6c277c82833581068c948e26a73ab663b30aaa1f0' 
  AND token = '5PncI86FWbxNIHEZQwAHTW0RFAJ8nnCw7hHDAsEHN5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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