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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6b1d8c409cc5e5e139c13a5a83874ab3f9dde4656aaca3009eca327d89a887e' 
  AND token = 'wf6du8OOsSkqEOCLRVq46Wdv5bKJkW+A7lgLztVxOuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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