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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b971181f3946198fda16ebb6b830509de6c3c87f97d28d39e3ba578231cca87a' 
  AND token = 'yW7xH8Avkuxekp7SxVPvFhid+y4sqAddUd9TCRR1Q9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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