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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c353996d7cc3535d75c519f7dac7356a936074fa713c351c0e73e2056fe039d8' 
  AND token = 'PWry4qufXKuKImcMYZw1OWRHfF4sl2qw89YdTY+ENaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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