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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ec4b285439f916f144a72f7e5c867cf279951b6a7b4d42d6dc4c79754819e3e' 
  AND token = 'BWZem257Ejc0XNH/4ybZ6maH4A5x9eCRz2SaUYf26E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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