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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27ff29b1eaec3c0636ea455fff257e0f0926e23702a411506539dc3a9ca2e6f8' 
  AND token = '0P7cIZpXS9AXtLlYnRHIhsmEXXdFpseiGMK6SiwX9KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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