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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '390a5bec8c939c82f336c6f2513df5c1bbaae60906c530a094ab32a1007b0d0b' 
  AND token = 'BrnCSXle7BY3qagCdCKWMfO2G+xbyGadoOwMH4smFdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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