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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a90c9694f017b216bccc2ce42e2fba5a6f39e7105a0d40b1c797868479df1974' 
  AND token = '1C5I3lgOQK78FinAi7KEuEAHBlFsgixNtXPIQJinwGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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