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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94f5bae5a8b926b8df935795a85ad10d5bf18125964495da15fb01d74a255a5e' 
  AND token = 'TUN0t8efpMHkilJreqbR+QDqG2k7MswWkP9El0i4G2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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