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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c828ba4ff4a92134e8152879f5355b434157c1581c10e5b7603645d4189f0cc8' 
  AND token = 's9C1WQQGduBdcss4KDWgevVdVhxsoOShEeI0F3MVCAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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